Beaverhead County, the City of Dillon, and the Town of Lima are working with the Federal Emergency Management Agency (FEMA) and Montana Department of Natural Resources and Conservation (DNRC) to update and produce new floodplain maps for the Beaverhead River, Blacktail Deer Creek, Selway Slough, Junction Creek in Lima and other flow splits from the Beaverhead River and Blacktail Deer Creek. Updated floodplain maps will depict the latest, most accurate flood risk data, and will eventually replace FEMA’s existing floodplain maps which are based on data from the late 1970s.

New Flood Insurance Rate Maps from this project are not expected to be finalized for a while – the study information and maps need to go through a technical and public review process 

When finalized, the new maps could have effects on some property owners in mapped floodplains (see Floodplain FAQs page for more information).

View Draft Floodplain Maps

 You can view individual draft maps and reports here: Maps & Technical Reports

Get more information on floodplain designations referenced on the maps:

• 100-Year Floodplain
• Floodway (within the 100-Year Floodplain)
• 500-Year Floodplain

Newly Mapped into a 100-Year Floodplain on the draft maps? See Low Cost Insurance Options

Attend a Public Open House Meeting

The County, City and Town are hosting two Public Open Houses to help property owners review the draft maps:

At either Public Open House, you will be able to:

• Speak with DNRC and County or City/Town Staff one-on-one about how floodplain map changes could affect your property. 
• Hear a short, informational presentation about the overall Floodplain Mapping Project at 5:15pm or 6:15pm.

Give comments during the official 90-Day Appeal and Comment Period

Later on this year, you will have the opportunity to submit an official comment or appeal about the proposed floodplain changes to FEMA. Check back here to stay informed on the specific dates of the appeal and comment Period (estimated early 2020).  In the meantime, the County, City and Town Floodplain Administrators welcome your questions and feedback.

Come back for more information

We will update this website with new, relevant information as this project progresses.

Know your property's flood risk

Flood Insurance Rate Maps indicate areas of flood risk. Once this project is complete, updated Flood Insurance Rate Maps will provide more accurate, current, and detailed data and mapping of flood risk areas.